利用热释电阵列相机的实时太赫兹扫描成像及图像去噪

Real-time terahertz scanning imaging by use of a pyroelectric array camera and image denoising.

作者信息

Li Qi, Ding Sheng-Hui, Yao Rui, Wang Qi

机构信息

National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, P.O. Box 3031, No. 2 YiKuang Street, Harbin 150080, China.

出版信息

J Opt Soc Am A Opt Image Sci Vis. 2010 Nov 1;27(11):2381-6. doi: 10.1364/JOSAA.27.002381.

DOI:10.1364/JOSAA.27.002381

PMID:21045902

Abstract

A high-resolution large-area terahertz (THz) scanning imaging system is demonstrated based on a 124×124 pyroelectric array camera and a CO(2) pumped continuous-wave THz laser. By applying a scanning mechanism to the real-time imaging setup, images of large-area targets were accomplished. Self-made resolution charts were employed to test the resolution. In order to improve the image quality, the noise in the images was studied and modeled, and then the performance of several denoising methods was compared with real-time THz original images. The experimental results show that, with the help of anisotropic diffusion, noise can be effectively suppressed, and the results are visually pleasant even when there is great attenuation. Those results greatly confirm application potentials of THz imaging using pyroelectric cameras in the field of concealed object detection.

摘要

基于124×124热释电阵列相机和CO(2)泵浦连续波太赫兹激光，展示了一种高分辨率大面积太赫兹（THz）扫描成像系统。通过将扫描机制应用于实时成像装置，完成了大面积目标的成像。使用自制的分辨率测试图来测试分辨率。为了提高图像质量，对图像中的噪声进行了研究和建模，然后将几种去噪方法的性能与实时太赫兹原始图像进行了比较。实验结果表明，借助各向异性扩散，可以有效抑制噪声，即使在存在很大衰减的情况下，结果在视觉上也令人满意。这些结果极大地证实了使用热释电相机的太赫兹成像在隐藏物体检测领域的应用潜力。